Variable heath-like shrub to 1.5 m tall; stems dense and intricate or erect, usually glabrous, smaller ones often spinescent. Leaves linear to linear-oblong, lanceolate, ovate or obovate, mostly 1.5–7 mm long, to c. 3 mm wide, green on both surfaces or brownish below, crowded to distant, flat or slightly concave, usually glabrous except for a few marginal cilia, subsessile, apex obtuse to subacute. Flowers c. 6 mm long, solitary or rarely paired; pedicels 1–2 mm long, glabrous; bracteoles 1–4 mm long, persistent. Calyx 2.5–4 mm long, glabrous or sparsely hairy, teeth equal to or longer than tube; standard broader than long, yellow, often streaked purple or red; wings yellow; keel purple. Pod 4–5 mm long; seeds usually 2, c. 2.5 mm long, brown-black.